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FAIR VALUE MEASUREMENTS Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Assets, Carrying Amount | $ 6,261 | $ 3,472
Short-term borrowings - trade receivable securitization facility, Carrying Amount | 486 | 349
Net Amount | 24,394 | 19,401
Prepaid Expenses and Other Current Assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Cap Assets | 20 | 0
Foreign Currency Contract, Asset | 3 | 0
Interest Rate Swap Asset Carrying Amount | 34 | 103
Other Noncurrent Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Cap Assets | 0 | 53
Interest Rate Swap Asset Carrying Amount | 0 | 41
Interest Rate Collar Assets | 3 | 17
Accrued Liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap agreements, Liabilities, Carrying Amount | 1 | 0
Foreign Currency Contract, Liability | 0 | 5
Interest Rate Cap Liabilities | 1 | 0
Other Non-Current Liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest rate swap agreements, Liabilities, Carrying Amount | 0 | 3
Interest Rate Cap Liabilities | 0 | 1
Interest Rate Collar Liability | 8 | 0
Term loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 8,642 | 6,179
Government Refundable Advances |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 17 | 21
Finance Lease Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 262 | 193
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents, Assets, Fair Value | 6,261 | 3,472
Fair Value, Inputs, Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Cap Assets | 20 | 0
Foreign Currency Contract, Asset | 3 | 0
Interest Rate Swap Asset at Fair Value | 34 | 103
Fair Value, Inputs, Level 2 [Member] | Other Noncurrent Assets |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Cap Assets | 0 | 53
Interest Rate Swap Asset at Fair Value | 0 | 41
Interest Rate Collar Assets | 3 | 17
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | 1 | 0
Foreign Currency Contract, Liability | 0 | 5
Interest Rate Cap Liabilities | 1 | 0
Fair Value, Inputs, Level 2 [Member] | Other Non-Current Liabilities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Interest Rate Cash Flow Hedge Liability at Fair Value | 0 | 3
Interest Rate Cap Liabilities | 0 | 1
Interest Rate Collar Liability | 8 | 0
Fair Value, Inputs, Level 2 [Member] | Term loans |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 8,694 | 6,212
Fair Value, Inputs, Level 2 [Member] | Government Refundable Advances |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 17 | 21
Fair Value, Inputs, Level 2 [Member] | Finance Lease Obligations [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 262 | 193
Senior Secured Notes $4.4B Due 2026 6.25% | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 0 | 4,377
Senior Secured Notes $4.4B Due 2026 6.25% | Fair Value, Inputs, Level 1 [Member] | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 0 | 4,329
Senior Secured Notes $2,100M due 2028 6.75% | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 2,077 | 2,071
Senior Secured Notes $2,100M due 2028 6.75% | Fair Value, Inputs, Level 1 [Member] | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 2,160 | 2,069
Senior Subordinated Notes $550M due 2027 7.50% | Senior Subordinated Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 0 | 548
Senior Subordinated Notes $550M due 2027 7.50% | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 0 | 549
Senior Subordinated Notes $2,650M due 2027 5.50% | Senior Subordinated Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 2,641 | 2,638
Senior Subordinated Notes $2,650M due 2027 5.50% | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 2,637 | 2,484
Senior Subordinated Notes $1,200M due 2029 4.625% | Senior Subordinated Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 1,194 | 1,193
Senior Subordinated Notes $1,200M due 2029 4.625% | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 1,160 | 1,047
Senior Subordinated Notes $750M due 2029 4.875% | Senior Subordinated Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 746 | 745
Senior Subordinated Notes $750M due 2029 4.875% | Fair Value, Inputs, Level 1 [Member] | Senior Subordinated Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 729 | 654
Senior Secured Notes $1,450M due 2030 6.875% | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 1,438 | 1,436
Senior Secured Notes $1,450M due 2030 6.875% | Fair Value, Inputs, Level 1 [Member] | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 1,519 | 1,423
Senior Secured Notes $2,750M due 2029 6.375% | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 2,727 | 0
Senior Secured Notes $2,750M due 2029 6.375% | Fair Value, Inputs, Level 1 [Member] | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 2,836 | 0
Senior Secured Notes $1,000M due 2031 7.125% | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 984 | 0
Senior Secured Notes $1,000M due 2031 7.125% | Fair Value, Inputs, Level 1 [Member] | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 1,058 | 0
Senior Secured Notes $2,200M due 2032 6.625% | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 2,180 | 0
Senior Secured Notes $2,200M due 2032 6.625% | Fair Value, Inputs, Level 1 [Member] | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 2,291 | 0
Senior Secured Notes $1,500M due 2033 6.00% | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Net Amount | 1,486 | 0
Senior Secured Notes $1,500M due 2033 6.00% | Fair Value, Inputs, Level 1 [Member] | Secured Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, Fair Value | 1,521 | 0
Asset-backed Securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term borrowings - trade receivable securitization facility, Carrying Amount | 486 | 349
Asset-backed Securities | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Short-term borrowings - trade receivable securitization facility, Fair Value | $ 486 | $ 349

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